package com.xingzhe.commons.utils;

import java.io.*;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.ProtocolException;
import java.net.URL;
import java.util.UUID;

public class GetUrlPic {
  
 public static void main(String[] args) throws Exception { 
  getImage("http://img4.51jiuqu.com/Storage/Plat/PageSettings/HomeFloor/7/floor_ScrollOne_20170621112819917685.jpg  "); 
 }
public static String getImage(String urlPath) throws MalformedURLException, IOException,
		ProtocolException, Exception, FileNotFoundException {
	String imageName = urlPath.substring(urlPath.lastIndexOf("/")+1);
	imageName = UUID.randomUUID().toString();
	//new一个URL对象 
	  URL url = new URL(urlPath); 
	  //打开链接 
	  HttpURLConnection conn = (HttpURLConnection)url.openConnection(); 
	  //设置请求方式为"GET" 
	  conn.setRequestMethod("GET"); 
	  //超时响应时间为5秒 
	  conn.setConnectTimeout(5 * 1000); 
	  //通过输入流获取图片数据 
	  InputStream inStream = conn.getInputStream(); 
	  //得到图片的二进制数据，以二进制封装得到数据，具有通用性 
	  byte[] data = readInputStream(inStream); 
	  //new一个文件对象用来保存图片，默认保存当前工程根目录 
	  File imageFile = new File(imageName); 
	  //创建输出流 
	  FileOutputStream outStream = new FileOutputStream("src/main/webapp/upload/image/20170707/"+imageFile);
	  //写入数据 
	  outStream.write(data); 
	  //关闭输出流 
	  outStream.close();
	  System.out.println("下载成功");
	  return imageName;
} 
 public static byte[] readInputStream(InputStream inStream) throws Exception{ 
  ByteArrayOutputStream outStream = new ByteArrayOutputStream(); 
  //创建一个Buffer字符串 
  byte[] buffer = new byte[1024]; 
  //每次读取的字符串长度，如果为-1，代表全部读取完毕 
  int len = 0; 
  //使用一个输入流从buffer里把数据读取出来 
  while( (len=inStream.read(buffer)) != -1 ){ 
   //用输出流往buffer里写入数据，中间参数代表从哪个位置开始读，len代表读取的长度 
   outStream.write(buffer, 0, len); 
  } 
  //关闭输入流 
  inStream.close(); 
  //把outStream里的数据写入内存 
  return outStream.toByteArray(); 
 } 
 
}